United Synthetic Multi-Viscosity TO-4 Fluid SAE 0W-20, 10W-30, 15W-40 is a heavy-duty, full synthetic drive train lubricant that is designed for transmissions, hydraulic systems, differentials and final drives of Caterpillar equipment. It possesses the required oxidation stability, deposit control, wear protection, frictional characteristics and seal compatibility as sort forth in Caterpillar specification TO-4. It will provide excellent service in both new and older Caterpillar equipment and also meets the Allison C-4 requirements for use in Allison powershift transmissions.